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Reversible long-range domain wall motion in an improper ferroelectric

Journal Article · · Nature Communications
 [1];  [2];  [3];  [3];  [4];  [5];  [2];  [2];  [3];  [6];  [7]
  1. Norwegian Univ. of Science and Technology, Trondheim (Norway); Univ. of Augsburg (Germany)
  2. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Univ. of Augsburg (Germany)
  6. Norwegian Univ. of Science and Technology, Trondheim (Norway)
  7. Norwegian Univ. of Science and Technology, Trondheim (Norway); Univ. of Canterbury, Christchurch (New Zealand)
Reversible ferroelectric domain wall movements beyond the 10 nm range associated with Rayleigh behavior are usually restricted to specific defect-engineered systems. Here, we demonstrate that such long-range movements naturally occur in the improper ferroelectric ErMnO3 during electric-field-cycling. We study the electric-field-driven motion of domain walls, showing that they readily return to their initial position after having traveled distances exceeding 250 nm. By applying switching spectroscopy band-excitation piezoresponse force microscopy, we track the domain wall movement with nanometric spatial precision and analyze the local switching behavior. Phase field simulations show that the reversible long-range motion is intrinsic to the hexagonal manganites, linking it to their improper ferroelectricity and topologically protected structural vortex lines, which serve as anchor point for the ferroelectric domain walls. Our results give new insight into the local dynamics of domain walls in improper ferroelectrics and demonstrate the possibility to reversibly displace domain walls over much larger distances than commonly expected for ferroelectric systems in their pristine state, ensuring predictable device behavior for applications such as tunable capacitors or sensors.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2586828
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 16; ISSN 2041-1723
Publisher:
Springer Science and Business Media LLCCopyright Statement
Country of Publication:
United States
Language:
English

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